Drain-cock.



W. E. FISHER.

DRAIN COCK. APPLICATION FILED MAY19. 1915.

Patented Nov. 23; 1915 iii srarn rarnr prion WILLIAM E. FISHER, OF SUSQUEHANNA, PENNSYLVANIA.

DRAIN-COCK.

Application filed May 19, 1915.

operated engines; and it is an object of my invention to provide a novel and improved device of this general character whereby a cylinder is thoroughly drained in substantially an automatic manner.

The invention consists in the details of construction and in the combination and arrangement of the several parts of my improved drain cock whereby certain important advantages are attained and the device is rendered simpler, less expensive and otherwise more convenient and advantageous for use all as will be hereinafter more fully set forth.

The novel features of the invention will be carefully defined in the appended claims.

In order that my invention may be the better understood, I will now proceed to describe the same with reference to the accompanying drawings, wherein Figure 1 is a longitudinal sectional view taken through a drain cock constructed in accordance with an embodiment-of my invention; and Fig. 2 is a transverse sectional view taken through the device as disclosed in Fig. 1.

As disclosed in the accompanying drawings, 1 denotes the casing of my improved valve having one extremity 2 reduced and exteriorly threaded so that the same may be readily applied to a cylinder C and the opposite end of said casing 1 is open and adapted to be closed by the removable cap 3 provided with the tubular extension 4:. The extension 4 is provided with the alined longitudinal slots 5 through which the operating member 6 is adapted to extend, said member 6 being herein disclosed as a cam element intended for a purpose which will hereinafter be self-evident. It is preferred that the member 6 be manually operated,

Specification of Letters Patent.

Patented Nov. 23, 1915.

Serial No. 29,205.

although I do not wish to be understood as limiting myself to this manner.

The inner end of the chamber of the casing 1 is provided with the valve seat 7 with which coacts the valve 8, said valve being normally maintained in contact with its seat under the influence of the expansible member 9, herein disclosed as a conventional coil sprmg, interposed between the annular shoulder 10 of the valve 8 and the cap 3. The spring 9 is preferably set for forty pounds above boiler pressure, although it will be readily appreciated that the tension of the spring may be controlled by the cap 3. The valve 8 is of a transverse diameter less than the corresponding diameter of the compartment of the casing 1 and the casing 1 is provided with the inwardly disposed radially spaced lugs 11 for guiding the valve, as is believed to be clearly shown in the accompanying drawings. The valve 8 is provided with an axial opening 12- in communication with the tubular extension 14- carried by the'valve, and the inner end of the opening 12 is provided with the valve seat 15 with which coacts the valve 16 mounted upon the stem 17 extending beyond the outer end of the extension and passing within the extension 1 of the cap 3, said stem being adapted for engagement by the operating member 6 whereby the same may be-raised and positively held in open position.

The outerextremity of the extension l-l is provided with the inwardly disposed lugs 18 which serve as guides for the stem 17 and interposed between said lugs 18 and the valve 16 is the expansible member 19, herein disclosed as a conventional coil spring, and preferably set for a pressure of forty pounds. lVhen the steam is admitted within the cylinder C, a pressure of more than forty pounds is required to close the valve 16 which is normally held off of its seat by the expansible member 19. As steam is admitted within the cylinder when cold, the steam condenses and such condensation will be forced out of the cylinder and through the opening 12 and through the openings 23 in the tubular extension 14 arranged intermediate the length of said extension. When the pressure within the cylinder becomes twenty pounds more than boiler pressure, the tension of the expansible member 9 is overcome and the valve 8 opens and thus assures .the discharge of the water within the cylinder .before suficient pressure has been accumulated to blow out the cylinder head or to crack the cylinder.

21 denotes a discharge elbow in communication with the chamber of the casing 1 and it; is to be noted that this elbow is capable of axial adjustment so that the water of condensation may drain under the engine or in any direction desired.

22 denotes a cap nut removably engaged with the valve 8 and serves to limit the movement of the valve 16 away from its seat. It is also to be observed that with the valve 16 in contact with the nut 22 the entry of cold air within the cylinder is sub stantially prevented. This is an essential feature of my invention, as otherwise the cold air would be drawn into the cylinder when the engine is drifted, would carbonize the oil and would destroy its lubricating qualities, resulting in broken cylinder packing and cut cylinders.

From the foregoing description, it is thought to be obviousthat a drain cock con structed in accordancewith my invention is of an extremely simple and comparatively inexpensive nature and is particularly well adapted for use by reason of the convenience and facility with which it may be assembled, and it will also be obvious that my invention is susceptible of some change and modification. without material departure from the scope of the appended claims and for this reason I do not wish to be under-,

stood as limiting myself to the precise arrangement and formation of the several parts herein shown in carrying out my invention in practice.

I claim:

1. A drain cock comprising a tubular casing having an interior valve seat, a movable valve within the casing coacting with the valve seat, said valve being tubular and the bore thereof being provided with a valve seat intermediate the length thereof, means for normally maintaining the valve closed,

said valve being provided with openings in communication with the bore thereof and with the interior of the casing, a movable valve coacting with the valve seat within the bore of the first named valve, said last named valve extending exteriorly of the first named valve, automatic means for maintaining the second named valve open, mechanical means eoactin with the stem of the second named valve for positively retaining said second named valve for open adjustment, and a cap nut engaged with the first named valve above the seat therein and with which the second valve is adapted to contact.

2. A drain cock comprising a tubular casing having an interior valve seat, a movable valve within the casing coacting with the valve seat, said valve being tubular and the bore thereof being provided with a valve seat intermediate the length thereof, means for normally maintaining the valve closed, said valve being provided with openings in communication with the bore thereof and with the interior of the casing, a movable valve coasting with the valve seat within the bore of the first named valve, said last named valve extending exteriorly of the first named valve, automatic means for maintaining the second named valve open, mechanical means coacting with the stem of the second named valve for positively retaining said second named valve for open adjustment, a cap nut engaged with the first named valve above the seat therein and with which the second valve is adapted to contact, and a discharge elbow in communication with the interior of the casing at a point intermediate the length thereof, said elbow being capable of axial adjustment.

In testimony whereof I hereunto afiix my signature in the presence of two witnesses.

WILLIAM E. FISHER.

Witnesses:

' OLIVER DOLAN,

C. M. Ernc.

. Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. C. 

